Well, went to LFS to get new pump, but of course the new one is slightly different than what I had for mounting.
Jeremy from Coralvue, called me while I was in the store. I went home to take a picture of my venturi, as I always had a feeling it was that. I have included the image I sent.
Jeremy's comments: "That is definitely your issue. I am surprised it was working at all."
Problem is that the air nozzle is going into the inner chamber, and is pretty close to the inner wall. This probably causing poor air flow, especially if things like salt, snails, debris plug it up. This causing my up and down inconsistancies and poor bubble head and no skimmate. When I unplug, it probably backflushes it clean, until it happens again. Even if it didn't plug up, skimming abilities probably would always be next to nothing, like I have been experiencing.
So I am glad to finally figure things out. Looking forward to having a new skimmer that works properly. YIPPPPEEEE!!!
I do want to thank Jeremy from Coralvue, also Dave and Denny at Concepts. They all were probably very frustrated with my persistence, but I am glad to finally get a resolution, and thanks to you all!!!
Now I wait for the new part.